various additions, changes, fixes, code cleanup --

* Makefile :
  - updated minIni.o target to minIni, output message upon build completion

* globals.h :
  - added STR_ERR_FMT_SECTION_NOT_FOUND

* ini-read.c :
  - added optional section parameter to the --dump command which will list the keys in the given section. --dump file [section]
  - implemented show_error_fmt() instead of show_error_f1().
  - fixed browsecb() to free memory it has strdup()ed (malloced).
  - application_init now inits data buffer.
  - removed unused variables, renamed variables for readabilty.

* ini-write.c :
  - implemented show_error_fmt() instead of show_error_f1().
  - fixed bug where writing to a non-existant ini file caused a "file not writable" error.
  - application_init now inits data buffer.
  - renamed some variables for readabilty.

* utils.c :
  - added ini_section_exists() to check for an existing [section] in an ini file.
  - added show_error_fmt(fmt,...) to show a formatted error message with any number of params.
  - removed show_error_f1() due to show_error_fmt() implementation.
  - updated application_init() to take parameters: buf, bufSize. Initializes the given buffer to 0 if != NULL.